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Thread: Dam, engine noise

  1. #1
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    Dam, engine noise

    hi guys, after many months of setting my system up in my house and testing i finally took it all into my car today for the install, and guess what, yup, dam engine noise.

    My setup,

    TS lilliuput, hard wired into cig lighter.
    HP epc powered using 300watt Inverter

    i have installed a Power dist block in the boot as the battery is also in the boot, the Inverter is hard wired into the Block, the ground cable is run directly to the battery.

    if the car is Off there is no problem, however as soon as i turn the car on i get the alternator sound, i have also removed the screen and tested it, same thing.

    i have a Soundlinx CD Changer Adptor unit, this replaced the chagner in the boot for a little box with rca's, from here its a simple rca to singel jack into the back of the Pc.

    I have also tested the complete system by using a Laptop running on battery and it works fine.

    So, if i use the Inverter, i get the noise.

    Can you guys please let me know what my best options are, including what i need to buy and where i need to connect it.

    Thanks, and i hve searched buy unable to find anything,

    Roger

  2. #2
    Newbie lucho's Avatar
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    Grounds

    I have my power inverter in the trunk off a distribution block, the other connects to my amp. I had noise until I grounded the inverter (short distance to a bolt in the back) I also grounded the PC to this same spot and also the amp. I had noise if I hook anything up to my cig lighter so I decided to plug my lillput in the inverter. Once I grounded the PC case to this same stop, it all worked fine.

    I then had to worry about flickering on my lilliput. I soldered a cable to the vga extension cable (anywhere you want on the outside of it) and grounded it too. No noise, no flickering. Make sure your grounds are good. Thats what helped me.

    Luis
    Epia M1000, two 80 GB Hard Drives, Lilliput 7" TS, 512 MB DDR, 300 Watt Power Inverter with Relay, Wireless USB Adapter. Routis 2004, Copilot 2003, Rayming TN-200 USB GPS in a 1999 Isuzu Rodeo

  3. #3
    Raw Wave Confused's Avatar
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    Ground the casing of your PC power supply to the same point as your inverter/audio equipment. That will remove some of your noise.

    The rest of your noise can be removed by using a DC-DC power supply.

    Flickering on Lilliput can be solved by wiring it up to a regulated output from your PC.


    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  4. #4
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    cheers guys,

    my brounding from my inverter geos directly to the battery along with the power cable, there is also a ground nut on the actual inverter, i have connected this to the body of the car.
    I tried grounding the PC P/s to the nut and still have the same issue, also have no problems with the screen.

    i've been searching and seen that some people use Ground Isolaters, what are your opionions.

    cheers

  5. #5
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    You should run a 12v line from the pc ps to power your screen. I did that and it eliminated noise.

    Also a sorter ground helps too. Dont use the one from the battery, that will create noise too.

    Depending on your type of audio cable, that can make a difference too. You should use something like monster cable that is well shielded.

    my 02.
    Squigg

    2002 Mustang GT
    xp2200,80gig,GF4MX4400,512ram,7inVGA Touchscreen, Side View Camera w/sound, USB GPS Mouse(computer hidden in LH Rear QP)

  6. #6
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    i cant do that as the pc i have is HP epc, this come's with a ac adaptor (same sort of ones that come with laptops) i also have a inverter and the manual states it needs to be connected directly to the battery.

    all the power and ground cables are good quality cables too.

    The audio is run via the standard cabled supplied by in my BMW, its the CD changer cable, i simply removed the changer and installed the Soundlinx adaptor that swops it from cd to rca connections.

  7. #7
    Low Bitrate philstuf's Avatar
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    Quote Originally Posted by eazyrog
    i cant do that as the pc i have is HP epc, this come's with a ac adaptor (same sort of ones that come with laptops) i also have a inverter and the manual states it needs to be connected directly to the battery.

    all the power and ground cables are good quality cables too.

    The audio is run via the standard cabled supplied by in my BMW, its the CD changer cable, i simply removed the changer and installed the Soundlinx adaptor that swops it from cd to rca connections.
    You can connect the positive lead of the inverter to the battery, but the best place for a ground for it is a heavy piece of metal (like close to a seat belt mount, or a seat mount). Ironically, the battery ground post is the noisiest ground in the entire vehicle. I know this flies in the face of the inverter's manual, but under normal circumstances the manufacturer only envisions you powering a lamp or portable TV off of it, not anything connected to the rest of the car's electrical system. I doubt the manufacturer even thinks you would connect it in any semi-permanent manner.

    If you then ground the chassis of your PC to this same point , you should be good to go. If you still encounter noise, take a 12 guage (I know, it sounds like overkill, but it is an effective remedy) wire, connect it from the same grounding point, to the chassis of the BMW radio (factory radios are notorious for using noisy grounds).

    Don't forget about your inverter's output. If there is a ground/earth pin on it, it may help to have it grounded to the chassis of your vehicle as well. Some inverters have a habit of "floating" the ground. I am going out on a limb here, but I am going to guess this is a UK 12volt to home-style "mains" converter. If I am not mistaken, UK power also has a earth/ground similar to the power over here in the US. Your mileage may vary, so be careful with that one (I do not know UK mains pinout like I know my own).

    -Phil
    1995 Thunderbird
    Clarion 9375 HU, 2X CDC1255 12 Disc changer, 7500 DSP/EQ/Xover (w/fiber optic interconnects), 7501 TV Tuner/Aux
    Xtant 1001d 1 Ch, 4180c 4 ch
    7" Xenarc VGA touchscreen
    1GHz Via-Nehemiah, 250 GB HDD
    XMPCR w/TOSLink, SB Audigy NX

  8. #8
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    Phill, thanks for the input.

    will remove the ground from the battery and connect it to the car body alond with all the other ground tonight.

    Will get back soon.

  9. #9
    Maximum Bitrate Bravellir's Avatar
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    What's the exact model number of your epc ? Depending on is power ratings, you can just plug one of that car adapters that people use to power their laptops. This should remove completly your inverter and it's noise, asuming that the noise its from bad power conections / inverter.

    Brave
    Ikea Case. Epia M10000.M1-ATX. 512 Mb. 2,5" 80 GB HDD. 7" Lilliput. BU-303 GPS. Sony Joystick.
    Status -->
    Lilliput Installed (not indash yet..)
    BraveCar 2.5

  10. #10
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    Bravellir,
    i would love to bin the inverter, ita been a pain in the arse since i started this project.

    Here are the pc details:

    HP E-PC s10
    E-VECTRA
    INPUT 19V---3160mA
    Intel Piii /256mb ram, onboard sound and nic.
    The computers comes with a ac-adaptor that has a figure 8 power cable.

    Could you please explain a little further on how i could bypass the inverter and connect this directly to the car battery or something ?

    Thanks mate.

    looking forward to your reply.

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